Superheater



E. H. FOSTER.

SUPERHEATER. APPLICATION men am. 4, .1919.

Mai? mm 1 Wired Patented July 18, 19

I 6 ym 4.

ERNEST H. FOSTER, 0F DONG-AN HILLS, NEW YGRK, ASSIGN'GR TOIE'O'WER COMPANY, OF NEW YORK, N. Y.,

A (JQRPORATION OF NEW YORK.

SUZERHEATER.

To all no/1 0m it may concern:

'Be it known that I, ERNEST H. FOSTER, a citizen of the United States of America, residin' at Dongan Hills, Richmond County and P, tats of New York, have invented certain new and useful Improvements in Super heaters, of which the following is a full, clear, and exact description.

The engineering problem of combining a superheater with boilers of the Stirling type has been heretofore solved by placing such superheater, usually with vertically disposed tubes, in the second pass behind the front battle. By this means the furnace gases after passing over-the first bank of tubes are deflected and sweep the superheater tubes.

This arrangement has proved to be the most practical and satisfactory, but it is not without certain object-ions which it has heretofore been very diilicult to wholly overcome, and this fact has led me to experiments and endeavors to devise some other equally if not better plan for the installation of superheaters in this type of boiler, which will obviate the objections to the generally adopted plan. My present application is based upon the improved plan which I have succeeded in developing for this purpose. a

in all boilers of this type, as is well known, a series of substantially vertical banks 0" tubes connect a plurality of upper with one or more lower drums, and the upper drums are connected by circulating tubes. According to my present improvement I place a superheater with horizontal rows of tubes between the first and second upper drums, and in the space between the upper and lower circulating tubes which connect them.

When thus located the effectiveness and practicability of the super-heater demand av special arrangement of the baffling, for

which purpose l carry up the baiile wall immediately back of the first bank of boiler tubes to a point where it will deflect the gases sufilciently to thoroughly wipe the superheater tubes, and a novel means of supporting the superheater, for which purpose I suspend it. by rods from a beam carried b standards which are mounted on the first and second boiler drums.

This is in general terms of description the improvement which forms the subject of this application. Other details of the construc-.

Mon and arrangement will be described by specification of Letters Patent.

Application filed December 4, 1919.

Serial Ho. 342529.

reference to the accompanying drawings, in wnich Fig. l is a sectional view of a Stirling boiler with a superheatcr located therein, in the manner above set forth. Fig. 2 is a cross-section of the boiler on the line 2-2 of Fig. 1.

The drawings show a specific form of boiler, which however is typical of a general class, in that it contains a plurality or upper drums l, 2, 3, a lower or mud drum 4, and banks of tubes 5, connecting the upper and lower drums.

Ordinarily and normally the bathing for such boilers comprises the bafiles herein designated by the numeral 6, so that the gases pass upward over the first bank and downward over the second. In these boilers also are circulating tubes '4' which connect the upper drums.

I place a superheater between the first and second upper drums l. and 2, and between the circulating tubes 7 which connect said drums. The superheater rests on a platform 8 which is suspended by rods 9 from a beam 10, which latter is secured to and carried by standards 11, mounted on 'thetwo drums l and 2.

The superheater tubes 19 are arranged in horizontal rows and extend transversely across the space which they occupy. They are connected to the usual headers 13 which are outside of this space, and the latter are connected with the boiler tubes and steam main in the usual manner.

In. order that the superheater tubes may be swept to the desired extent by the hot gases,

stitut-ing a bathe, is supported in any proper manner so that it will serve an extension of the front baffle wall 5 and this slab continued upward through the circulating tubes 7, and the superheater tubes 12. to point where it will insure the proper deflection of the gases to secure the desired'degree of superheat. This may vary, and for that reason the extentto which this vertical bathe is carried up through the superheater, tubes correspondingly vary, and in this way a variable degree of superheat may be ob tained in a very simple and economical way. Inasmuch as the hottest gases are deflected in this device so as to sweep the drums .1 and 2, it is desirable to protect these from the (iii superheater tubes.

excessive heat and for this purpose plates of infusible metal 15. such as cast iron, are'supported over the exposed surfaces of said drums adjacent the superheater.

In all respects other than those herein noted, the construction of the boiler and superheater follows well known lines, and calls for no more specific description. This arrangement has proved to be eminently satisfactory and efiicient. Access to the superheater for any purpose is rendered very easy. the construction of the boiler is interfered with to the least possible extent, and the matter of regulation and control made easy and practical.

ll'hat I claiznias my invention is: I

1. The combination in a steam boiler of the Stirling type as herein described where:

in a plurality of upper drums are connectec. by circulating tubes, of a superheater with transverse parallel vertical rows of tubes placed. between the circulating tubes connect: ing the first and second upper drums, a beam mounted on and above said drums, a support for the superheater suspended therefrom and a verti'al bafiie which forces the furnace gases up and over the superheater tubes, said 'ballle extending up centrally between the transverse vertical rows of superheater tubes.

2. The combination with a boiler of the Stirling type de cribed, 'of a superheater baring transverse horizontal rows of tubes in the space between the first and/second upper drums and between the circulating,

tubes connecting said drums; of a vertical bafile which forces the furnace gases up an over the superheater tubes. said baflle extending up between the transverse horizontal 3. The combination in a steam boilerof the Sterling type as herein described wherein a plurality of upper drums are connected circulating tubes, of a main header leading posed entirely above. the lower circulating by circulating tubes, of a superheater placed in the space between the first and second upper drums and entirely above a group of cross-circulator tubes, said superheater comprisin a plurality of elements which extend laterafiy across the entire lower group of circulate! tubes in a direction parallel to the drums and a baflle for directing the hot gases from the boiler through the aforesaid group of circulator tubes and laterally across the superheater elements.

4. The combination in a-steam boiler of the Sterling type-as herein described wherein a plurality of upper drums are connected by circulating tubes, of a superheater having the heating elements thereof placed in the space between the firstand second upper drums and disposed entirely above the lower circulator tubes, said elements extending parallel with the drums and being sub stantially coextensive in length with the depth of the boiler, and means for directing hot gases through the circulating tubes and through the superheater.

5. The combination with a boiler of the Sterling type as herein described wherein a plurality of upper drums are connected by to the boiler and a main header leading to the steam main, said main headers being disposed laterally across the drnms,.of a plurality of depending headers extending downwardly from the said main headers and a plurality of straight superheater elements disposed parallel to thedrums zind connecting the said last mentioned headers, said elements forming a superheater-which is distubes and? in the space between the drums. y In testimony whereof I hereunto afilx my signature. 4

- ERNEST H. FOSTER.- 

